Q. In helium nucleus, there are
A) 2 protons and 2 electrons
B) 2 neutrons, 2 protons and 2 electrons
C) 2 protons and 2 neutrons
D) 2 positrons and 2 protons
Explanation
(c) Helium nucleus $\rightarrow \ _{2}He^{4}$
Number of protons $= Z = 2$
Number of neutrons $= A - Z = 2$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.